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. 2019 Sep;35(5):493–500. doi: 10.6515/ACS.201909_35(5).20190312A

Figure 2.

Figure 2

The validated pediatric algorithm. Step 1 analyzes R/S ratio in V1; if the R/S ≥ 1, left-side WPW is definite, and if the R/S < 1, the AP needs further evaluation by the polarity of the delta wave of Lead I. Step 2 analyzes the delta wave polarity in V1 ≥ 1 in V1 for differentiating free wall and septum in left-side AP and analyzing the delta wave polarity in Lead I to differentiate into left- and right-side AP. Step 3 uses the delta wave polarity in Lead III that can separate partial right septum AP form right free wall. Step 4 further separates the right septum and right free wall AP by the delta wave polarity of V1.